I've recently been having diarrhea and may be calling in sick to work tomorrow. I work at a small company, so typically this involves emailing my manager and team with something like this:
Hi team, I seem to have caught the flu that's going around my son's day care. I'll be working from home today so I don't get anyone else sick.
In this case I was looking for a similar way to communicate with my manager/coworkers without grossing them out, but still making it clear that it's really in everyone's best interest for me to stay home.